diff -r 2bdc3ac5e77c -r 55a55a9ec2c2 src/basics.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/basics.h	Sun Sep 22 11:51:41 2019 +0300
@@ -0,0 +1,88 @@
+/*
+ *  LDForge: LDraw parts authoring CAD
+ *  Copyright (C) 2019 Teemu Piippo
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include <cstdio>
+#include <cstdlib>
+#include <cmath>
+#include <QMatrix4x4>
+#include <QObject>
+#include <QPointF>
+#include <QSet>
+#include <QString>
+#include <QStringList>
+#include <QVariant>
+#include <QVector>
+#include <QVector3D>
+
+using GLRotationMatrix = QMatrix4x4;
+
+enum Axis
+{
+	X,
+	Y,
+	Z
+};
+
+enum Winding
+{
+	NoWinding,
+	CounterClockwise,
+	Clockwise,
+};
+
+/*
+ * Special operator definition that implements the XOR operator for windings.
+ * However, if either winding is NoWinding, then this function returns NoWinding.
+ */
+inline Winding operator^(Winding one, Winding other)
+{
+	if (one == NoWinding or other == NoWinding)
+		return NoWinding;
+	else
+		return static_cast<Winding>(static_cast<int>(one) ^ static_cast<int>(other));
+}
+
+inline Winding& operator^=(Winding& one, Winding other)
+{
+	one = one ^ other;
+	return one;
+}
+
+template<typename T, std::size_t N>
+constexpr std::size_t countof(T(&)[N])
+{
+	return N;
+}
+
+static constexpr long double pi = M_PIl;
+
+// http://stackoverflow.com/a/18204188/3629665
+template<typename T>
+inline auto rotl10(T x)
+	-> std::enable_if_t<std::is_arithmetic_v<T>, T>
+{
+	return (x << 10) | ((x >> 22) & 0x000000ff);
+}
+
+template<typename T>
+inline auto rotl20(T x)
+	-> std::enable_if_t<std::is_arithmetic_v<T>, T>
+{
+	return (x << 20) | ((x >> 12) & 0x000000ff);
+}